Sheet-metal piston.



T. E. MURRAY.

S HEET METAL PISTON.

APPLICATIQN FILED DEC-14,1916- 1,215,969. Patented Feb.13,1917.

F3 6: anveufop Jam km s

rnomas E. MURRAY, or NEW YORK, N. Y.

SHEET-METAL PISTON.

Specification of Letters Patent.

Patented Feb. 13, 1917.

Application filed December 14, 1916. Serial No. 136,861.

To all whom it may concern:

Be it known that I, THOMAS E. MURRAY, a citizen of the United States, residing at New York, in the county of New York and State of New York, have invented a certain new and useful Improvement in Sheet-Metal Pistons, of which the following is a specification.

The invention is a piston having internal sleeves for the reception of the piston rod pin, the said piston and sleeves being formed of struck up sheet metal, with the parts united by electrically welded joints, and a method of making said piston.

In the accompanying drawings Figure 1 represents the blank from which one of the half sections of the piston is made. Fig. 2 is an elevation, and Fig. 3 is a transverse section of one of said half sections. Fig. 4 is a section similar to'Fig. 3, with one of the internal sleeves electrically welded in place. Fig. 5 is a section on the line :0, w of Fig. 6, of the completed piston. Fig. 6 is a section on the line y, 3 of Fig. 5. showing the cover plate electrically welded in place.

Similar letters of reference indicate like parts.

The blank A, Fig. 1, from which each half section of the piston is formed, is a parallelogram of sheet metal of suitable dimensions;

In said blank I produce by striking up or stamping, a circular openingB and a flange or rib C surrounding said opening. I then bend the blank into semi-circular form, and at the same time strike up the channels D for the reception of the usual packing rings or gaskets. I then electrically weld to the rib C,.the butt end of a sleeve E, also of sheet metal. I produce in this way, two similar half sections A, A, Fig. 5. I- then electrically weld the longitudinal edges of said half sections as shown at F. To one end of the cylinder thus'produced, I weld electrically the head G, which I also stamp from sheet metal, preferably with an integral circular struck u strengthening rib H.

The sleeves E are esigned to receive the usual pin by which the piston rod is connected to'the piston, said rod then entering the piston through the open end thereof, and

into the space between the inner ends of said sleeves E.

In this way, I produce a piston wholly of sheet metal, with its parts connected by electrically welded joints, thus forming a complete homogeneous and strong structure. No machining is required to fit the parts, and the cost of manufacture is largely reduced.

I claim:

1. A piston, comprising a hollow cylinder having diametrically opposite circular openings in its wall, and integral iii-turned flanges surrounding said openings, a cylinder head, and sleeves respectively united at their outer ends to said flanges and separated at their inner ends: the said cylinder sleeves and head being formed of struck up sheet metal and united by electrically welded joints.

2. A piston, comprising a hollow cylinder having diametrically opposite circular openings in its wall, and integral in-turned flanges surrounding said openings and circumferential grooves on the exterior of said wall, a cylinder head, and sleeves respectively united at their outer ends to said flanges and separated at their inner ends: the said cylinder, sleeves and head being formed of struck up sheet metal and united by electrically welded joints.

3. A cylindrical piston of sheet metal,

comprising two semi-cylindrical half sec-1 tions, each formed by striking up the sheet, the said sections being united at their longitudinal edges, an internal circular rib integrally formed on the concave side of each section, the said ribs surrounding diametrically opposite circular openings in said sections, a cylinder head, and sleeves united at their outer ends to said ribs, the said sleeves being in line and having their inner ends separated: the said sections, sleeves and head being formed of struck up sheet metal and united by electrically welded joints.

4. The method of making a hollow cylindrical piston of sheet metal, which consists in, first, forming on each of two flat sheets a circular opening and an integral flange surrounding said opening, second, bending each of said sheets to form a semi-cylindri cal half section, with said flange on its concave side, third, eleetricslly'butt-welding In testimony whereof I have aflixed my said flanges, sleeves, each of '9, length less signature in presence of two Witnesses.

than the semi-diameter of said piston 2 i i fourth, electrically Welding together said S MURRAY semi-cylindrical sections at their longitudi- -Witnesses: m1 edges, and fifth, electrically Welding a GERTRUDE T-EORTER,

head of sheet metal to one end of said piston. MAY T. MOGARBY. 

